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GPT-5Sep 25, 2026openai/gpt-5-2025-08-07
Are humans responsible for climate change?
Yes. The overwhelming scientific evidence shows humans are the primary cause of modern climate change, especially the rapid warming since the mid‑20th century.
Why scientists are confident:
•Greenhouse gases from burning fossil fuels, deforestation, and industry have risen sharply (CO2 is ~50% above preindustrial levels), strengthening the greenhouse effect.
•The “fingerprints” match human causes: the lower atmosphere warms while the stratosphere cools; nights and winters warm faster; the Arctic warms fastest; oceans store most of the excess heat.
•Climate models only reproduce the observed long‑term warming when human emissions are included; natural drivers alone (solar changes, volcanoes) can’t explain it.
•Multiple independent records show widespread changes consistent with warming: rising global temperatures (roughly 1.1–1.3°C above late‑1800s levels), sea‑level rise, ocean heat gain, retreating ice and glaciers.
•Major scientific bodies (e.g., the IPCC and national academies) state it is unequivocal that human activities have warmed the atmosphere, ocean, and land.
Natural variability still affects year‑to‑year conditions, but the long‑term trend is dominated by human influence.